SIGMA 2
1
1. INTRODUCTION
1.1 IMPORTANT
SIGMA 2 must be serviced in accordance
with the Servicing Schedule on at least an
annual basis. Please refer to notes under
Servicing.
These instructions for the use, care and
maintenance of the apparatus must be
followed to ensure the correct and safe
operation of SIGMA 2.
For any enquiries regarding the use of
SCOTT breathing apparatus, please
contact Training and Technical Support
Services at Scott Health and Safety
Limited.
1.2 BREATHABLE AIR
Air used to supply or charge breathing
apparatus may be natural or synthetic. The
composition of breathable air is given in
Table 1.
COMPONENT
MASS %
(Dry Air)
VOLUME%
(Dry Air)
OXYGEN 23.14 20.948
NITROGEN 75.52 78.08
ARGON 1.29 0.93
CARBON
DIOXIDE
0.05 0.031 4
HYDROGEN 0.000 003 0.000 05
NEON 0.001 270 0.001 818
HELIUM 0.000 037 0.000 524
KRYPTON 0.000 330 0.000 114
XENON 0.000 039 0.000 009
Table 1: Breathable Air
There is an increased fire risk when the
oxygen content is above the value shown.
The purity/quality of air used to supply and
charge breathing apparatus should be
tested periodically in accordance with
national regulations. If not specified
otherwise, contaminants shall not exceed
the permissible exposure level.
National regulations must be observed.
The mineral oil content shall be such that
the air is without the odour of oil. The odour
threshold is in the region of 0.3 mg/m
3
.
The water content shall not exceed 50
mg/m
3
for 207 bar apparatus and 30 mg/m
3
for 300 bar apparatus.
1.3 APPARATUS DURATION
All durations quoted are nominal, based on
an Average Wearer Consumption Rate of
40 litres/minute and FULLY CHARGED
cylinders. Actual Wearer Consumption rates
vary due to many factors, such as:
1. Workload: high work rates increase
consumption rates.
2. Weight of apparatus and use of
heavy or restrictive clothing.
3. Work environments with extremes of
heat or cold.
4. Physical fitness of the wearer.
5. Other factors include emotional
stress and fatigue.
It is important that all wearers are aware of
these factors and take account of them
when assessing cylinder duration.
1.4 PERSONNEL TRAINING
Personnel who use self-contained,
compressed air breathing apparatus must
be fully trained in accordance with these
instructions and national regulations.
These instructions cannot replace an
accredited training course run by fully
qualified instructors in the proper and safe
use of SCOTT breathing apparatus.
Please contact Training and Technical
Support Services or your distributor for
training course details.
Training and Technical Support
Services:
Scott Health and Safety Limited
Pimbo Road,
West Pimbo,
Skelmersdale,
Lancashire,
WN8 9RA,
England.
Tel: +44 (0) 1695 711711
Fax: +44 (0) 1695 711775
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